-16.46% is the change from 79 to 66
Calculation steps:
[( 66 - 79 ) ÷ 79] x 100 = -16.46%
Formula
Percentage change = [(66 - 79) / 79] x 100
Subtract the new number by the original number
66 - 79 = -13
-13 ÷ 79 = -0.16455696202531644
-0.16455696202531644 x 100 = -16.46%